Reorganize tests for samples so the test is discoverable from the sample

samples/clock/test/clock_test.dart

Index: samples/clock/test/clock_test.dart
diff --git a/samples/tests/samples/browser/clock_test.dart b/samples/clock/test/clock_test.dart
similarity index 87%
rename from samples/tests/samples/browser/clock_test.dart
rename to samples/clock/test/clock_test.dart
index d06cc0531267512d0065089366b7d959bd503f46..0a08b99f78bd073cc4fe044a0c404a81a0cad127 100644
--- a/samples/tests/samples/browser/clock_test.dart
+++ b/samples/clock/test/clock_test.dart
@@ -4,7 +4,7 @@
 
 library clock_test;
 
-import '../../../clock/web/clock.dart' as clock;
+import '../web/clock.dart' as clock;
 
 // @static-clean
 
@@ -12,6 +12,5 @@ import '../../../clock/web/clock.dart' as clock;
  * This test exists to ensure that the clock sample compiles without errors.
  */
 void main() {
-  
-}
 
+}